seaweedfs/weed/filesys/wfs.go

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package filesys
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import (
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"context"
"fmt"
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"math"
"os"
"strings"
"sync"
"time"
"github.com/karlseguin/ccache"
"google.golang.org/grpc"
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"github.com/chrislusf/seaweedfs/weed/filer2"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/fuse"
"github.com/seaweedfs/fuse/fs"
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)
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type Option struct {
FilerGrpcAddress string
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GrpcDialOption grpc.DialOption
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FilerMountRootPath string
Collection string
Replication string
TtlSec int32
ChunkSizeLimit int64
DataCenter string
DirListCacheLimit int64
EntryCacheTtl time.Duration
Umask os.FileMode
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MountUid uint32
MountGid uint32
MountMode os.FileMode
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MountCtime time.Time
MountMtime time.Time
OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
Cipher bool // whether encrypt data on volume server
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}
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var _ = fs.FS(&WFS{})
var _ = fs.FSStatfser(&WFS{})
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type WFS struct {
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option *Option
listDirectoryEntriesCache *ccache.Cache
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// contains all open handles, protected by handlesLock
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handlesLock sync.Mutex
handles []*FileHandle
pathToHandleIndex map[filer2.FullPath]int
bufPool sync.Pool
stats statsCache
// nodes, protected by nodesLock
nodesLock sync.Mutex
nodes map[uint64]fs.Node
root fs.Node
}
type statsCache struct {
filer_pb.StatisticsResponse
lastChecked int64 // unix time in seconds
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}
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func NewSeaweedFileSystem(option *Option) *WFS {
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wfs := &WFS{
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option: option,
listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(option.DirListCacheLimit * 3).ItemsToPrune(100)),
pathToHandleIndex: make(map[filer2.FullPath]int),
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bufPool: sync.Pool{
New: func() interface{} {
return make([]byte, option.ChunkSizeLimit)
},
},
nodes: make(map[uint64]fs.Node),
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}
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wfs.root = &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}
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return wfs
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}
func (wfs *WFS) Root() (fs.Node, error) {
return wfs.root, nil
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}
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func (wfs *WFS) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
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err := pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
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client := filer_pb.NewSeaweedFilerClient(grpcConnection)
return fn(client)
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}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
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if err == nil {
return nil
}
return err
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}
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func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
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fullpath := file.fullpath()
glog.V(4).Infof("%s AcquireHandle uid=%d gid=%d", fullpath, uid, gid)
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wfs.handlesLock.Lock()
defer wfs.handlesLock.Unlock()
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index, found := wfs.pathToHandleIndex[fullpath]
if found && wfs.handles[index] != nil {
glog.V(2).Infoln(fullpath, "found fileHandle id", index)
return wfs.handles[index]
}
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fileHandle = newFileHandle(file, uid, gid)
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for i, h := range wfs.handles {
if h == nil {
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wfs.handles[i] = fileHandle
fileHandle.handle = uint64(i)
wfs.pathToHandleIndex[fullpath] = i
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glog.V(4).Infof("%s reuse fh %d", fullpath, fileHandle.handle)
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return
}
}
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wfs.handles = append(wfs.handles, fileHandle)
fileHandle.handle = uint64(len(wfs.handles) - 1)
wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle)
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glog.V(4).Infof("%s new fh %d", fullpath, fileHandle.handle)
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return
}
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func (wfs *WFS) ReleaseHandle(fullpath filer2.FullPath, handleId fuse.HandleID) {
wfs.handlesLock.Lock()
defer wfs.handlesLock.Unlock()
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glog.V(4).Infof("%s ReleaseHandle id %d current handles length %d", fullpath, handleId, len(wfs.handles))
delete(wfs.pathToHandleIndex, fullpath)
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if int(handleId) < len(wfs.handles) {
wfs.handles[int(handleId)] = nil
}
return
}
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// Statfs is called to obtain file system metadata. Implements fuse.FSStatfser
func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error {
glog.V(4).Infof("reading fs stats: %+v", req)
if wfs.stats.lastChecked < time.Now().Unix()-20 {
err := wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.StatisticsRequest{
Collection: wfs.option.Collection,
Replication: wfs.option.Replication,
Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec),
}
glog.V(4).Infof("reading filer stats: %+v", request)
resp, err := client.Statistics(context.Background(), request)
if err != nil {
glog.V(0).Infof("reading filer stats %v: %v", request, err)
return err
}
glog.V(4).Infof("read filer stats: %+v", resp)
wfs.stats.TotalSize = resp.TotalSize
wfs.stats.UsedSize = resp.UsedSize
wfs.stats.FileCount = resp.FileCount
wfs.stats.lastChecked = time.Now().Unix()
return nil
})
if err != nil {
glog.V(0).Infof("filer Statistics: %v", err)
return err
}
}
totalDiskSize := wfs.stats.TotalSize
usedDiskSize := wfs.stats.UsedSize
actualFileCount := wfs.stats.FileCount
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// Compute the total number of available blocks
resp.Blocks = totalDiskSize / blockSize
// Compute the number of used blocks
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numBlocks := uint64(usedDiskSize / blockSize)
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// Report the number of free and available blocks for the block size
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resp.Bfree = resp.Blocks - numBlocks
resp.Bavail = resp.Blocks - numBlocks
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resp.Bsize = uint32(blockSize)
// Report the total number of possible files in the file system (and those free)
resp.Files = math.MaxInt64
resp.Ffree = math.MaxInt64 - actualFileCount
// Report the maximum length of a name and the minimum fragment size
resp.Namelen = 1024
resp.Frsize = uint32(blockSize)
return nil
}
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func (wfs *WFS) cacheGet(path filer2.FullPath) *filer_pb.Entry {
item := wfs.listDirectoryEntriesCache.Get(string(path))
if item != nil && !item.Expired() {
return item.Value().(*filer_pb.Entry)
}
return nil
}
func (wfs *WFS) cacheSet(path filer2.FullPath, entry *filer_pb.Entry, ttl time.Duration) {
if entry == nil {
wfs.listDirectoryEntriesCache.Delete(string(path))
} else {
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wfs.listDirectoryEntriesCache.Set(string(path), entry, ttl)
}
}
func (wfs *WFS) cacheDelete(path filer2.FullPath) {
wfs.listDirectoryEntriesCache.Delete(string(path))
}
func (wfs *WFS) getNode(fullpath filer2.FullPath, fn func() fs.Node) fs.Node {
wfs.nodesLock.Lock()
defer wfs.nodesLock.Unlock()
node, found := wfs.nodes[fullpath.AsInode()]
if found {
return node
}
node = fn()
if node != nil {
wfs.nodes[fullpath.AsInode()] = node
}
return node
}
func (wfs *WFS) forgetNode(fullpath filer2.FullPath) {
wfs.nodesLock.Lock()
defer wfs.nodesLock.Unlock()
delete(wfs.nodes, fullpath.AsInode())
}
func (wfs *WFS) AdjustedUrl(hostAndPort string) string {
if !wfs.option.OutsideContainerClusterMode {
return hostAndPort
}
commaIndex := strings.Index(hostAndPort, ":")
if commaIndex < 0 {
return hostAndPort
}
filerCommaIndex := strings.Index(wfs.option.FilerGrpcAddress, ":")
return fmt.Sprintf("%s:%s", wfs.option.FilerGrpcAddress[:filerCommaIndex], hostAndPort[commaIndex+1:])
}